US8303104B2 - Inkjet recording apparatus and image forming apparatus - Google Patents

Inkjet recording apparatus and image forming apparatus Download PDF

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Publication number
US8303104B2
US8303104B2 US12/724,659 US72465910A US8303104B2 US 8303104 B2 US8303104 B2 US 8303104B2 US 72465910 A US72465910 A US 72465910A US 8303104 B2 US8303104 B2 US 8303104B2
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Prior art keywords
ink
discharge
blank
receiver
blank discharge
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US20100231676A1 (en
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Takashi Miyagi
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Ricoh Co Ltd
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Ricoh Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0085—Using suction for maintaining printing material flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/007—Conveyor belts or like feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16585—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles for paper-width or non-reciprocating print heads

Definitions

  • the present invention relates to inkjet recording apparatuses and image forming apparatuses. More specifically, the present invention relates to an inkjet recording apparatus that prints on a recording medium (which is hereinafter called a paper sheet) conveyed by a conveyance member such as a conveyor belt by discharging ink from nozzles in an ink discharging head, and an image forming apparatus that utilizes the inkjet recording apparatus.
  • a recording medium which is hereinafter called a paper sheet
  • a conveyance member such as a conveyor belt
  • a so-called “blank discharge” is generally performed to maintain a sufficient ink discharge by always preventing nozzles in an ink discharge head from drying, other than nozzle maintenance performed before starting the next print job.
  • the nozzles discharge ink irrelevant to image forming toward an area above a paper sheet being conveyed during printing, a conveyance member between the paper sheets, or a blank discharge ink receiver disposed behind a conveyance unit through a paper sheet suction hole provided in the conveyance member or through an opening provided in the conveyance member only for the blank discharge.
  • the blank discharge contaminates a surface of a conveyor belt with the ink because a head nozzle faces the surface of the conveyor belt that is the conveyor member, on a paper sheet supporting side.
  • a technique that displaces the conveyor belt, and carries an ink receiver for the blank discharge into a position where the conveyor belt has existed is proposed.
  • the inkjet recording apparatus in this technique has a complex structure and has grown in size as a whole, and even causes a decrease of printing efficiency because a transfer action for the conveyor belt being displaced and carrying the ink receiver in place of the conveyor belt make a printing interruption time longer.
  • Patent Document 1 a blank discharge in an inkjet recording apparatus is disclosed.
  • a nozzle discharges ink irrelevant to image forming toward a blank discharge ink receiver disposed behind a conveyor belt through a paper sheet suction hole provided in the conveyor belt at a proper timing during printing.
  • the inkjet recording apparatus includes the blank discharge ink receiver that is large enough to be able to receive even spreading blank discharge ink.
  • the blank discharge ink receiver has such a large size, a small ink droplet, especially misty ink, tends to float up in the air around a blank discharge receiver part, which sometimes causes the ink to overflow outside the ink receiver from a gap between the ink receiver and an opposing face plate.
  • a suction unit e.g., suction fan
  • the inside of the blank discharge ink receiver is reduced to a negative pressure due to air flow caused by the suction fan, and even a relatively big ink droplet once returned to the blank discharge ink receiver falls out of the gap between the blank discharge ink receiver and the opposing face plate. This sometimes causes not only a decrease of an ink recovery rate, but also an accumulation of contamination by the blank discharge ink around the blank discharge receiver, and diffuse emission of the blank discharge ink outside the inkjet recording apparatus by the paper sheet suction fan.
  • FIG. 1 is a diagram showing a side of a conventional public blank discharge ink receiver 22 .
  • FIG. 1 shows a blank discharge ink recovery mechanism that includes blank discharge ink receivers 22 Y through 22 K arranged along a recording head line. A paper sheet is suctioned and carried from the left to the right of FIG. 1 .
  • the recording heads 18 Y through 18 K respectively include plural head nozzles arranged in a direction perpendicular to a paper sheet conveyance direction (i.e., a direction perpendicular to the plane of paper of FIG. 1 ).
  • the blank discharge ink receivers 22 Y through 22 K have a length capable of accepting an ink droplet flow discharged from the head nozzles for the blank discharge (which is hereinafter called a blank discharge ink flow; refer to FIG. 18 ).
  • a suction fan 23 is provided under the blank discharge ink receiver 22 as a paper sheet suction unit, which makes it possible to suction and hold the paper sheet carried onto a surface of a conveyor belt 8 through plural suction holes 8 a provided through the conveyor belt 8 and plural suction holes 13 a provided through a belt flexure prevention member 13 , and to carry the paper sheet.
  • the blank discharge ink flow 19 that first flows into the blank discharge ink receiver 22 does not stay in the inside space of the blank discharge ink receiver 22 , and a part of the blank discharge ink flow 19 leaks out from a top edge 22 a of the blank discharge ink receiver 22 as an outward ink flow 19 a.
  • embodiments of the present invention may provide a novel and useful inkjet recording apparatus and an image forming apparatus solving or reducing one or more of the above-described problems.
  • the embodiments of the present invention may provide an ink-jet recording apparatus and an image forming apparatus to prevent decrease of a recovery rate of blank discharge ink that is recovered once and to prevent contamination of the periphery of a blank discharge ink receiver by leaked ink.
  • an inkjet recording apparatus to print by discharging ink onto a surface of a recording medium, the apparatus including:
  • a suction unit to suction the recording medium on the surface of the endless rotation conveyance member by suctioning air through the through-holes of the endless rotation conveyance member
  • an ink discharge head including a plural of ink discharge nozzles arranged in a direction perpendicular to a recording medium conveyance direction;
  • a blank discharge ink receiver to receive ink discharged from the ink discharge nozzles and passing through the through-holes, the blank discharge ink receiver being disposed in a position corresponding to the ink discharge nozzles in an inner circumference area of the endless rotation conveyance member;
  • control unit to cause the ink discharge nozzles to discharge the ink when there is no recording medium on the endless rotation conveyance member and the through-holes come to a position facing the ink discharge nozzles;
  • the fixed plate provided along an inner surface of the endless rotation conveyance member in the inner circumference area, the fixed plate including an opening formed in a position corresponding to the ink discharge nozzles and a through-hole to suction air,
  • the blank discharge ink receiver is disposed corresponding to the opening of the fixed plate and in close contact with the fixed plate so that an inside space of the blank discharge receiver becomes a substantially closed space.
  • an image forming apparatus including an inkjet recording device to print by discharging ink onto a surface of a recording medium, the apparatus including:
  • a medium feeding part to provide the recording medium for the inkjet recording device provided upstream of the inkjet recording device in a recording medium conveyance direction;
  • a suction unit to suction the recording medium on the surface of the endless rotation conveyance member by suctioning air through the through-holes of the endless rotation conveyance member
  • an ink discharge head including a plurality of ink discharge nozzles arranged in a direction perpendicular to a conveyance direction of the recording medium;
  • a blank discharge ink receiver to receive ink discharged from the ink discharge nozzles and passing through the through-holes, the blank discharge ink receiver being disposed in a position corresponding to the ink discharge nozzles in an inner circumference area of the endless rotation conveyance member;
  • control unit to cause the ink discharge nozzles to discharge the ink when there is no recording medium on the endless rotation conveyance member and the through-holes come to a position facing the ink discharge nozzles;
  • the fixed plate provided along a inner surface of the endless rotation conveyance member in the inner circumference area, the fixed plate including an opening formed in a position corresponding to the ink discharge nozzles and a through-hole to suction
  • the blank discharge ink receiver is disposed corresponding to the opening of the fixed plate and in close contact with the fixed plate so that an inside space of the blank discharge receiver becomes a substantially closed space.
  • FIG. 1 is a view showing a conventional blank discharge ink receiver seen from a direction perpendicular to a paper sheet conveyance direction;
  • FIG. 2 is an outline view showing a blank discharge ink flow
  • FIG. 3 is a view for explaining an outward ink flow
  • FIG. 4 is a side view showing a main part configuration of an image forming apparatus configured with an ink-jet recording apparatus in an embodiment of the present invention
  • FIG. 5 is a top view of a blank discharge ink receiver of in the embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of FIG. 5 along a line A-A;
  • FIG. 7 is a view showing the blank discharge ink receiver seen from a direction perpendicular to a paper sheet conveyance direction in the embodiment of the present invention.
  • FIG. 8 is a view showing a blank discharge ink receiver seen from a direction perpendicular to a paper sheet conveyance direction in another embodiment of the present invention.
  • FIG. 9 is a cross-sectional view showing the blank discharge ink receiver shown in FIG. 8 seen from a direction parallel to the paper sheet conveyance direction in the embodiment of the present invention.
  • FIG. 10 is a view showing a third embodiment of the present invention.
  • FIG. 11 is a view showing a fourth embodiment of the present invention.
  • FIG. 12 is a cross-sectional view showing the blank discharge ink receiver shown in FIG. 10 and FIG. 11 seen from a direction parallel to the paper sheet conveyance direction in the embodiments of the present invention
  • FIG. 13 is a view showing where a further provided pressurizing mechanism makes the blank discharge ink receiver stick fast to an elastic member
  • FIG. 14 is a view showing where the blank discharge ink receiver is separated from the elastic member by pressure release
  • FIG. 15 is an outline view showing a top part configuration of the blank discharge ink receiver
  • FIG. 16 is a side view showing another type of the blank discharge ink receiver of the present invention.
  • FIG. 17 is a side view showing a blank discharge ink receiver of another embodiment of the same type as FIG. 16 ;
  • FIG. 18 is a cross-sectional view showing a sealing system of the blank discharge ink receiver in FIG. 17 seen from a direction parallel to the conveyance direction;
  • FIG. 19 is a view showing a configuration of a blank-discharge-ink-recovery-type blank discharge ink receiver seen from a direction perpendicular to the paper sheet conveyance direction;
  • An image forming apparatus 100 is configured for color printing.
  • a paper feeding part 1 is arranged on the left side of FIG. 4
  • a paper ejection part 12 is arranged on the right side of FIG. 4 .
  • a paper conveyance path is formed inside the image forming apparatus 100 from the paper feeding part 1 to the paper ejection part 12 .
  • a pair of paper feeding rollers 5 , 5 and a pair of resist rollers 2 , 2 are provided just downstream of the paper feeding part 1 , which is configured to send paper sheets 3 as recording media from the left side to the right side of FIG. 4 .
  • a conveyor belt 8 is provided so as to be hung and wrapped around two belt rollers 6 , 7 .
  • the conveyor belt 8 is shaped into an endless loop, and constitutes an upper path 8 X for conveying the paper sheets 3 and a lower path 8 Y of a return route.
  • the conveyor belt 8 includes many suction holes 8 a (see FIG. 9 ) that double as openings for letting blank discharge ink through between the paper sheets 3 (see FIG. 9 ).
  • the suction holes 8 a form hole arrays arranged at a predetermined distance in a direction perpendicular to a paper sheet conveyance direction.
  • the hole arrays are arranged at a predetermined distance from each other in the paper sheet conveyance direction.
  • the holes included in the plural hole arrays are arranged so as to pass positions facing all of the nozzles in a recording head.
  • a belt standard hole array recognition marker is provided at a part of the conveyor belt 8 (which is not shown in drawings).
  • a suction fan 23 (see also FIG. 9 ) is installed inside the loop of the conveyor belt 8 as a suction unit for the paper sheets 3 , which allows the paper sheet 3 sent by the pair of paper feed rollers 5 , 5 and resist rollers 2 , 2 to be conveyed toward the downstream direction by driving the belt roller 6 , and suctioning the paper sheets 3 on a surface of the upper path 8 X through the suction holes 8 a (which are not shown in FIG. 4 ) provided through the conveyor belt 8 .
  • An ink discharge unit 4 is provided at a position facing the surface of the upper path 8 X in the conveyor belt 8 , and the paper sheet conveyance path is formed in a gap between the lower surface of the discharge unit 4 and the upper path 8 X of the conveyor belt 8 .
  • the ink discharge unit 4 is disposed as four color heads along the paper sheet conveyance direction, corresponding to four color inks (which include yellow Y, magenta M, cyan C, black B).
  • a minute diameter nozzle is provided to discharge the ink onto the surface of the paper sheet 3 on the conveyor belt 8 .
  • the nozzles of each color heads are mutually arranged in a direction perpendicular to the paper sheet conveyance direction of the conveyor belt 8 , and the arranged nozzles of the plural color heads constitute a head array and are mutually arranged at a predetermined distance. Furthermore, by shifting the head arrays adjacent in the paper sheet conveyance direction by a predetermined amount in a direction perpendicular to the paper sheet conveyance direction, the color heads are arranged in a zigzag formation, which constitutes a recording head 18 as a so-called line type head having a length corresponding to a width of the paper sheet 3 .
  • the other color heads corresponding to the other colors are arranged as well as the above-mentioned yellow color head 18 Y, and constitute recording heads 18 M, 18 C, 18 K. Moreover, the head arrays are fixed to a head base 17 that is a common member to set mutual positions.
  • a flexure prevention member 13 is provided to prevent the conveyor belt 8 from sagging during the paper sheet conveyance.
  • the flexure prevention member 13 includes openings 13 b for blank discharge so as to face all of the head nozzles, and also includes suction holes 13 a for paper suction only (see FIG. 5 ).
  • a blank discharge ink receiver 22 ′ is provided connected to ink receiver side plates 24 (see FIG. 5 and FIG. 6 ).
  • FIG. 5 shows an outline top view including the ink receiver side plates 24 .
  • each of the blank discharge receivers 22 ′ has a shape slightly larger than the corresponding opening 13 b for receiving the blank discharge, so as to encompass the opening 13 b for the blank discharge ink.
  • the suction holes 13 c for the paper suction are also provided between the adjacent openings 13 b for the blank discharge ink in a direction perpendicular to the paper sheet conveyance direction and outside the openings 13 b disposed on both ends in a line.
  • FIG. 6 shows a cross-sectional surface along the line A-A in FIG. 5 of one of the blank discharge ink receivers 22 ′.
  • the blank discharge ink receiver 22 ′ only parts facing the openings 13 b for the blank discharge ink constitute a shape for receiving the blank discharge ink by protruding more than the other shaped parts, and the top part 22 ′ a is held to stick fast to a back surface of the flexure prevention member 13 .
  • the other areas have a shape separated from the back surface of the flexure prevention member 13 at a predetermined distance, so as not to prevent air flowing from suction holes 13 c.
  • the paper sheet 3 conveyed on the upper side path 8 X of the conveyor belt 8 passes under the four recording heads 18 Y, 18 M, 18 C, 18 K in sequence, maintaining a plane state. Then, a desired color image is formed by discharging the colors of ink from the corresponding head nozzles onto an upper surface (i.e., printing surface) of the paper sheet 3 .
  • a first paper sheet detection part 9 lying between the pair of paper feeding rollers 5 , 5 and the pair of resist rollers 2 , 2 reads a position and a length in the conveyance direction of the paper sheet 3 .
  • a recording position detection part 10 attached to the ink discharge head unit 4 is for determining ink discharge timing onto the paper sheet 3 , and doubles as a detection unit of the back end of the paper sheet 3 .
  • a second paper sheet detection part 11 lying downstream of the paper sheet conveyance direction of the ink discharge head unit 4 reads a position of the paper sheet 3 .
  • a paper sheet back end detection part 14 lying above the belt roller 6 of the downstream side is for detecting a paper jam or determining a next paper feed timing.
  • the paper ejection part 12 includes a catch tray 15 that piles up the paper sheets 3 on which images are recorded, and a jump platform 12 a to guide the under surface of the paper sheets 3 and to send out the paper sheets 3 to the catch tray 15 .
  • an image memory stores the image data from a host computer through a communication interface (all of which are not shown in FIG. 4 ).
  • a system controller 50 drives the paper feeding rollers 5 , 5 with a paper feeding driver 45 , and the paper feeding rollers 5 , 5 separate and convey the top paper sheet 3 from the piled paper sheets 3 on the paper feeding part 1 toward the pair of resist rollers 2 , 2 downstream of the paper sheet conveyance direction.
  • the system controller 50 drives the suction fan 23 disposed within the inner circumference of the conveyor belt 8 , and the conveyor belt 8 begins a conveyance operation by starting to drive the belt roller 6 at a predetermined timing.
  • the system controller 50 drives the pair of resist rollers 2 , 2 with a resist roller driver 42 , and the resist rollers 2 , 2 convey the paper sheet 3 onto the surface of the conveyor belt 8 (i.e., the upper side path 8 X).
  • the conveyor belt 8 starts a suction-and-conveyance operation.
  • the system controller 50 detects the head of the paper sheet 3 reaching a sensor part of the recording position detection part 10 , the system controller 50 makes the recording heads 18 Y, 18 M, 18 C, 18 K of the ink discharge head unit 4 record at predetermined timings based on the detection result.
  • the image data stored in the image memory (which is not shown in FIG. 4 ) are sent to a print control part (which is not shown in FIG. 4 ) and are transformed into dot data of the colors through a head driver (which is not shown in FIG. 4 ).
  • the head driver generates a drive control signal for each of the four recording heads 18 Y, 18 M, 18 C, 18 K.
  • the nozzles discharge the ink onto the printing surface of the paper sheet 3 by the inputting of the generated drive control signals into the nozzles of the respective recording heads.
  • the print control part not shown in FIG. 4 controls the ink discharge timing of the four color recording heads 18 Y, 18 M, 18 C, 18 K, synchronizing with a conveyance speed of the paper sheet 3 , and based on the detection result from the recording position detection part 10 , it is possible to form an image without stopping the conveyance of the paper sheet 3 .
  • the paper sheet 3 on which an image is recorded is continuously conveyed by the conveyor belt 8 and ejected to the paper ejection part 12 .
  • Control is set to perform the blank discharge after a predetermined elapsed time or a predetermined numbers of recordings (which includes the time of one recording).
  • the system controller 50 preliminarily detects the head of the next paper sheet 3 to be conveyed with the first paper detection part 9 .
  • the controller causes the nozzle in the recording head 18 Y of the ink discharge head unit 4 to discharge the ink that does not contribute to printing through use of the head driver (which is not shown in FIG. 4 ), at a predetermined timing after the back end of the paper sheet 3 in current conveyance passes a detection position of the recording position detection part 10 .
  • the system controller 50 obtains a time until the standard hole array reaches a position facing the first recording head 18 Y by operation. For all of the holes 13 b belonging to plural hole arrays led by the belt standard hole array, the blank discharge is performed from the nozzles facing the corresponding holes 13 b in the recording head 18 Y in sequence.
  • the nozzles in the recording head 18 Y discharge the ink for the blank discharge that does not contribute to printing toward the suction holes 8 a disposed in the conveyor belt 8 so as to pass a position facing all of the head nozzles in the recording head 18 Y.
  • FIG. 4 shows a configuration that includes two blank discharge ink receivers 22 ′ for each color, in order to correspond to the zigzag formation by mutually adjacent nozzles in respective colors.
  • the system controller 50 controls the ink discharge timing so that the ink for the blank discharge from the other recording heads 18 M, 18 C, 18 K is discharged toward the almost same position as the hole 8 a of the conveyor belt 8 toward which the ink is discharged from the recording head 18 Y.
  • the system controller 50 makes the nozzles of the other recording heads 18 M, 18 C, 18 K discharge in sequence their blank discharge ink toward the same position as the blank discharge position of the ink by the recording head 18 Y.
  • a timing shifting way of the respective recording heads 18 M, 18 C, 18 K in the blank discharge is the same as a timing shifting way of the respective recording heads 18 M, 18 C, 18 K in usual printing. The difference is that the former way is based on the detection signal of the back end of the paper sheet 3 by the recording position detection part 10 , while the latter way is based on the detection signal of the head of the paper sheet 3 .
  • FIG. 7 shows a first embodiment of the present invention.
  • elastic perforated packing 21 such as rubber is fitted on the back surface of the flexure prevention member 13 so that a hole of the perforated packing 21 fits in the opening 13 b for the blank discharge ink.
  • a space inside the blank discharge receiver 22 is configured as an enclosed space encompassing its surroundings, except an opening facing the opening 13 b for the blank discharge ink.
  • a blank discharge ink flow 19 b discharged from the head nozzle in the recording head 18 after reaching a bottom surface of the blank discharge ink receiver 22 , rises along a side wall and is introduced toward the bottom surface again, joining a subsequent blank discharge ink flow 19 b . Furthermore, because the blank discharge ink flow 19 b is unaffected by an air flow created by the suction fan 23 , the blank discharge ink flow 19 b remains static, and even a misty fine ink particle tends to pile up (which can be also called a stagnant ink flow 19 b ). As a result, it is possible to improve a recovery rate of the blank discharge ink and to prevent contamination except that of the blank discharge ink receiver by the leaking ink.
  • FIG. 8 shows another embodiment of a blank discharge receiver.
  • a cross section of a blank discharge receiver 22 ′ is shaped into a convex (i.e., ) shape.
  • a cross section of the blank discharge ink receiver 22 ′ in a direction perpendicular to the paper sheet conveyance direction may be shaped into a convex shape around all of the openings 13 b for the blank discharge ink, as shown in FIG. 6 .
  • FIG. 9 shows a cross-sectional view of the blank discharge ink receiver 22 ′ seen from a direction parallel to the paper sheet conveyance direction. This corresponds to FIG. 1 . Since most components in FIG.
  • FIG. 10 shows a third embodiment of a blank discharge ink receiver.
  • the blank discharge ink receiver is divided into two of a small blank discharge ink receiver 22 s and a large blank discharge ink receiver 22 d .
  • the small blank discharge ink receiver 22 s is fitted on a back surface of a flexure prevention member 13 in a unified manner without a gap, and a perforated packing 21 is fitted on the under surface of the small blank discharge ink receiver 22 s .
  • a perforated packing 21 is fitted on the under surface of the small blank discharge ink receiver 22 s .
  • the ink attached to the packing 21 might drop into the suction fan 23 located below as the embodiment in FIG. 7 .
  • it is not necessary to accurately perform an alignment between an opening 13 b for the blank discharge ink in a flexure prevention member 13 and an opening of the blank discharge ink receiver 22 d as in the embodiment in FIG. 8 it is possible to work easily during maintenance.
  • FIG. 11 shows a fourth embodiment of a blank discharge ink receiver.
  • a downward protrusion 21 b is newly added to a part of the packing hole 21 a circumference in FIG. 10 .
  • the protrusion 21 b functions as a current plate that introduce a blank discharge ink flow 19 b , which rises along a circumference side wall after reaching the bottom surface, toward a bottom surface side of the blank discharge ink receiver 22 d again.
  • the protrusion 21 b has an effect of leading and letting down the ink that has become droplets resulting from the ink attached to the packing 21 , the droplets gathering toward the bottom surface side of the blank discharge ink receiver 22 d .
  • the packing 21 may be shaped to have a downward slope toward the protrusion 21 b .
  • a surface of the packing 21 has a water repellent effect.
  • FIG. 12 a cross-sectional view of the blank discharge ink receiver 22 in FIG. 10 and FIG. 11 seen from a parallel direction to the paper sheet conveyance direction is shown in FIG. 12 .
  • FIG. 12 corresponds to FIG. 9 .
  • FIG. 13 shows a configuration adding a pressurization/pressure release mechanism of a blank discharge ink receiver.
  • plural blank discharge ink receivers 22 ′′ provided corresponding to recording heads 18 Y to 18 K are, as mentioned above, integrated by two ink receiver plates 24 (which is shown in a dotted line) one on each end in a longer direction (which corresponds to a direction perpendicular to the paper sheet conveyance direction) as a blank discharge ink receiver unit 43 .
  • two L letter shape slide rails 25 are provided to take a blank discharge ink receiver unit 43 in and out during maintenance.
  • pressurizing arms 26 , 26 ′ are provided on both ends in the paper sheet conveyance direction of the ink receiver side plates 24 of a front side and back side in a direction perpendicular to a paper plane.
  • One of springs 27 biases the pressurizing arm 26 downstream of the paper sheet conveyance direction in a clockwise rotational direction, about an axis 29
  • the other spring 27 biases the pressurizing arm 26 ′ upstream of the paper sheet conveyance direction in a counterclockwise rotational direction, about an axis 29 ′.
  • the pressurization/pressure release mechanism is set to have a predetermined gap between the respective blank discharge ink receivers 22 ′′ and the slide rails 25 .
  • FIG. 14 is a view showing where the blank discharge ink receiver 22 ′′ is distant from the perforated packings 21 .
  • a pressure release mechanism including the springs 27 turns the pressurizing arm 26 downstream of the paper sheet conveyance direction in the counterclockwise direction, about the axis 29 , and turns the pressurizing arm 26 ′ upstream of the paper sheet conveyance direction in the clockwise direction, about the axis 29 ′. Since the blank discharge ink receiver unit 43 comes down due to its own weight to horizontal parts of the slide rails 25 , it is possible to readily take the blank discharge ink receiver unit 43 in and out along the slide rails 25 .
  • FIG. 15 shows a view of the blank discharge ink receivers 22 ′′ seen from a direction parallel to the paper sheet conveyance direction.
  • rubber hardness or thickness of the blank discharge ink receiver 22 ′′ is optimized, and the blank discharge ink receiver 22 ′′ has a slight arc shape 28 in its top part so that adhesion degree of the blank discharge ink receiver 22 ′′ in a longer direction becomes almost uniform.
  • this example adopts a method where the blank discharge ink receiver 22 ′′ sticks fast to the facing packing 21 without a gap, making the whole blank discharge ink receiver 22 ′′ bend, by lifting the respective ink receiver side plates 24 of front and back ends in a direction perpendicular to the paper plane.
  • FIG. 16 and FIG. 17 show another type of embodiment.
  • the inside of the blank discharge ink receiver 22 ′′ is configured as an enclosed space encompassing its surroundings except the opening of the part facing the flexure prevention member 13 , by pressing and sticking the top of the blank discharge ink receiver 22 ′′ to the facing surface of the packing 21 at a predetermined pressure.
  • a blank discharge ink receiver 32 is configured as an enclosed space encompassing its surroundings except the opening of the part facing the flexure prevention member 13 , in a featured form where a one side or both sides of a side wall part of the blank discharge ink receiver 32 is sandwiched by a lip shape parts 30 a made of plural rows provided within an area of packing 30 .
  • a mechanism to take the blank discharge ink receiver 32 , 32 d in and out during the maintenance may be a simple structure in a degree that there can be a gap S from the far end. This makes it possible to reduce the part cost.
  • a cross-sectional view of the blank discharge ink receiver 32 in FIG. 16 seen from a direction parallel to the paper sheet conveyance direction is shown in FIG. 18 .
  • the blank discharge ink receiver 22 , 22 ′, 22 s , 22 d , 22 ′′, 32 , 32 d described above suppose that the blank discharge ink receiver 22 , 22 ′, 22 s , 22 d , 22 ′′, 32 , 32 d have a configuration to accumulate the blank discharge ink from the respective head nozzles.
  • FIG. 19 is a view showing a blank discharge ink receiver unit 44 in cross-section along the line A-A in FIG. 5 with the recording head 18 and the conveyor belt 8 .
  • the paper sheet 3 is conveyed from the front side to the back side toward the paper plane.
  • the blank discharge ink receiver unit 44 fixed to a flexure prevention member 13 is provided with a suction fan 23 in an integrated way, and a blank discharge ink receiver plate 49 installed inside, sloping at a predetermined angle ⁇ .
  • An outlet 46 is formed at a side end of the blank discharge ink receiver unit 44 , and the outlet 46 is connected to a downstream end of the sloping blank discharge ink receiver plate 49 .
  • a waste liquid tube 47 is fixed to the outlet 46 , and the other end of the waste liquid tube 47 is connected to a waste tank 48 .
  • the waste liquid tube 47 forms a waste liquid path.
  • the inside space of the blank discharge ink receiver unit 44 substantially forms an enclosed space except openings for blank discharge ink, suction holes and the outlet 46 to the waste liquid path, within an area that is influenced by an air flow to suction the paper sheet 3 on the conveyor belt 8 , formed by operation of the suction fan 23 .
  • ink I discharged for the blank discharge hits the blank discharge ink receiver plate 49 , then goes out of the outlet 46 along the slope of the blank discharge ink receiver plate 49 , and is recovered in the waste tank 48 through the waste liquid tube 47 .
  • the embodiment in FIG. 19 has a configuration that integrates the suction fan 23 into the blank discharge ink receiver unit 44 . Since the blank discharge ink receiver unit 44 exists alone, the air flow to suction the paper sheet 3 on the conveyor belt 8 , formed by the operation of the suction fan 23 , occurs through suction holes 13 a , 13 c in the flexure prevention member 13 outside an area the single blank discharge ink receiver occupies.
  • the blank discharge ink receiver unit 44 is a single blank discharge ink receiver for a flat surface part of the conveyor belt 8 as mentioned above while the ink-accumulation-type blank discharge ink receivers are plurality disposed along the paper sheet conveyance direction of the conveyor belt 8 so as to face the corresponding head nozzles, as roughly shown in FIG. 4 .
  • the suction fan 23 by dividing the suction fan 23 from the blank discharge ink receiver, it is possible to configure the ink-recovery type blank discharge receiver so as to dispose the plural blank discharge ink receivers along the paper sheet conveyance direction of the conveyor belt 8 , facing the head nozzles.
  • an ink-jet recording apparatus and an image forming apparatus of the embodiments of the present invention by providing a fixed plate along a circumference surface into an endless rotation conveyance member in an inner circumference area of the endless rotation conveyance member, by forming an opening at a position corresponding to an ink discharge nozzle and a through-hole for air suction into the fixed plate, by sticking a blank discharge ink receiver to the fixed plate without a gap, and by making an inside space of the blank discharge ink receiver an enclosed space except for an opening of a part corresponding to the opening of the fixed plate, it is possible to prevent blank discharge ink from leaking out of a gap between the fixed plate and the blank discharge ink receiver due to a negative pressure caused by an air flow for paper suction flowing in almost the same direction as an ink discharge direction. Moreover, it is possible to improve a recovery rate of the blank discharge ink and to prevent contamination other than that of the blank discharge ink receiver.
  • the endless rotation conveyance member is a belt
  • the fixed plate as a face plate of a surface bearing for the belt
  • instability of belt behavior can be solved.
  • plural through-holes are arranged to be able to correspond to all of the ink discharge nozzles, blank discharge can be performed to keep a sufficient discharge state in all of the arranged head nozzles.
  • the blank discharge ink receiver is disposed extending in a array direction of the plural discharge nozzles so as to correspond to the plural discharge nozzles, and formed as a container having a protrusion part only in an area facing the fixed plate, one blank discharge ink receiver can cover the plural head nozzles arranged in a direction perpendicular to the paper sheet conveyance direction, which makes it possible to reduce a total number of the blank discharge ink receivers even if the number of head nozzles is many.
  • the suction holes for the paper suction between the openings of the fixed plate by which suction power of the paper sheet can be ensured.
  • the top shape of the blank discharge ink receiver becomes a convex shape in both directions perpendicular and parallel to the paper sheet conveyance direction, it is possible to keep an ink flow discharged into the discharge space in an area without the protrusion part of the blank discharge ink receiver when the ink flow rebounds from the bottom surface. This makes it possible to reduce an amount of the blank discharge ink possibly left between the blank discharge ink receiver and the fixed plate, and to improve the recovery rate. Also, if the fixed plate is provided with the protrusion part in an integrated manner, and the other part of the blank discharge ink receiver is formed as a member sticking to the protrusion part without a gap, production and installation of the blank discharge ink receiver becomes easier.
  • the ink By forming an outlet for ink recovery at the blank discharge ink receiver, and by sloping the inside space of the blank discharge ink receiver to the outlet, the ink does not accumulate in the blank discharge ink receiver, so that time and effort to replace the blank discharge ink receiver does not occur.
  • disposing a tank to recover the blank discharge ink discharged from the outlet disposing the recovered ink is easy.

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140132688A1 (en) * 2012-11-12 2014-05-15 Seiko Epson Corporation Liquid ejecting apparatus
US20150273878A1 (en) * 2014-04-01 2015-10-01 Kyocera Document Solutions Inc. Conveyor device and inkjet recording apparatus
US20160167404A1 (en) * 2013-07-28 2016-06-16 Hewlett-Packard Industrial Printing Ltd. Media support
US9764566B2 (en) * 2014-07-18 2017-09-19 Bobst Mex Sa Suction box for a system for conveying flat media and printing machine thus equipped
US10926557B2 (en) * 2019-03-14 2021-02-23 Xerox Corporation Vacuum transport having jetting area allowing periodic jetting of all nozzles

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5547624B2 (ja) * 2010-12-17 2014-07-16 大日本スクリーン製造株式会社 画像記録装置
JP2014104708A (ja) * 2012-11-29 2014-06-09 Seiko Epson Corp 液体噴射装置、液体噴射方法
JP5918159B2 (ja) * 2013-03-06 2016-05-18 富士フイルム株式会社 画像形成装置
JP6513008B2 (ja) * 2015-09-30 2019-05-15 キヤノン株式会社 液体保持容器
JP2022148025A (ja) 2021-03-24 2022-10-06 京セラドキュメントソリューションズ株式会社 インクジェット記録装置

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6409332B1 (en) * 2000-02-28 2002-06-25 Hewlett-Packard Company Low flow vacuum platen for ink-jet hard copy apparatus
US20020109768A1 (en) * 2001-02-06 2002-08-15 Martin Greive Device for simultaneously holding by suction and transporting a sheet
JP2003341106A (ja) 2002-05-30 2003-12-03 Konica Minolta Holdings Inc 画像記録装置
JP2004106359A (ja) 2002-09-19 2004-04-08 Ricoh Co Ltd インクジェット記録装置
US6918650B2 (en) * 2002-07-26 2005-07-19 Brother Kogyo Kabushiki Kaisha Inkjet recording apparatus, ink guide member and purge unit
JP2006159556A (ja) 2004-12-06 2006-06-22 Seiko Epson Corp 液体噴射装置および液体噴射装置における液体予備吐出方法
US7083274B2 (en) * 2003-09-19 2006-08-01 Fuji Xerox Co., Ltd. Inkjet recording apparatus
US20070146456A1 (en) * 2005-12-26 2007-06-28 Fujifilm Corporation Image recording apparatus
JP2007168277A (ja) 2005-12-22 2007-07-05 Kyocera Mita Corp インクジェット記録装置
US20070291096A1 (en) * 2006-06-15 2007-12-20 Canon Kabushiki Kaisha Inkjet recording apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2817964B2 (ja) * 1989-09-05 1998-10-30 キヤノン株式会社 液体噴射記録装置
JP4608738B2 (ja) * 2000-06-06 2011-01-12 コニカミノルタホールディングス株式会社 インクジェット記録装置
JP2004299219A (ja) * 2003-03-31 2004-10-28 Toppan Forms Co Ltd インクジェットプリンティングシステム
JP2005022320A (ja) * 2003-07-04 2005-01-27 Sony Corp 液体吐出装置
JP2008229966A (ja) * 2007-03-19 2008-10-02 Canon Inc インクジェット記録装置
JP5052426B2 (ja) * 2008-06-25 2012-10-17 株式会社リコー 画像形成装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6409332B1 (en) * 2000-02-28 2002-06-25 Hewlett-Packard Company Low flow vacuum platen for ink-jet hard copy apparatus
US20020109768A1 (en) * 2001-02-06 2002-08-15 Martin Greive Device for simultaneously holding by suction and transporting a sheet
JP2003341106A (ja) 2002-05-30 2003-12-03 Konica Minolta Holdings Inc 画像記録装置
US6918650B2 (en) * 2002-07-26 2005-07-19 Brother Kogyo Kabushiki Kaisha Inkjet recording apparatus, ink guide member and purge unit
JP2004106359A (ja) 2002-09-19 2004-04-08 Ricoh Co Ltd インクジェット記録装置
US7083274B2 (en) * 2003-09-19 2006-08-01 Fuji Xerox Co., Ltd. Inkjet recording apparatus
JP2006159556A (ja) 2004-12-06 2006-06-22 Seiko Epson Corp 液体噴射装置および液体噴射装置における液体予備吐出方法
JP2007168277A (ja) 2005-12-22 2007-07-05 Kyocera Mita Corp インクジェット記録装置
US20070146456A1 (en) * 2005-12-26 2007-06-28 Fujifilm Corporation Image recording apparatus
US20070291096A1 (en) * 2006-06-15 2007-12-20 Canon Kabushiki Kaisha Inkjet recording apparatus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
U.S. Appl. No. 12/574,966, filed Oct. 7, 2009.
U.S. Appl. No. 12/635,939, filed Dec. 11, 2009.

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9211732B2 (en) * 2012-11-12 2015-12-15 Seiko Epson Corporation Liquid ejecting apparatus
US20140132688A1 (en) * 2012-11-12 2014-05-15 Seiko Epson Corporation Liquid ejecting apparatus
US10300715B2 (en) 2013-07-28 2019-05-28 Hp Scitex Ltd. Media support
US20160167404A1 (en) * 2013-07-28 2016-06-16 Hewlett-Packard Industrial Printing Ltd. Media support
US10105967B2 (en) * 2013-07-28 2018-10-23 Hp Scitex Ltd. Media support
US10252550B2 (en) 2013-07-28 2019-04-09 Hp Scitex Ltd. Media support
US10259237B2 (en) 2013-07-28 2019-04-16 Hp Scitex Ltd. Media support
US10549555B2 (en) 2013-07-28 2020-02-04 Hp Scitex Ltd. Media support
US10828916B2 (en) 2013-07-28 2020-11-10 Hp Scitex Ltd. Media support
US9216594B2 (en) * 2014-04-01 2015-12-22 Kyocera Document Solutions Inc. Conveyor device and inkjet recording apparatus
US20150273878A1 (en) * 2014-04-01 2015-10-01 Kyocera Document Solutions Inc. Conveyor device and inkjet recording apparatus
US9764566B2 (en) * 2014-07-18 2017-09-19 Bobst Mex Sa Suction box for a system for conveying flat media and printing machine thus equipped
US10926557B2 (en) * 2019-03-14 2021-02-23 Xerox Corporation Vacuum transport having jetting area allowing periodic jetting of all nozzles

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